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y in (-oo:+oo)
12*y^3-(((16*y^2)/4)*y^2) = 0
12*y^3-4*y^4 = 0
12*y^3-4*y^4 = 0
4*y^3*(3-y) = 0
3-y = 0 // - 3
-y = -3 // * -1
y = 3
4*y^3 = 0
4*y^3 = 0 // : 4
y^3 = 0
y = 0
y in { 3, 0 }
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